Ignition Timing: Adjustments
Idle Speed/Ignition Timing/Idle Mixture Ratio AdjustmentPREPARATION
1. Make sure that the following parts are in good order.
- Battery
- Ignition system
- Engine oil and coolant levels
- Fuses
- ECM harness connector
- Vacuum hoses
- Air intake system
(Oil filler cap, oil level gauge, etc.)
- Fuel pressure
- Engine compression
- Throttle valve
- Evaporative emission system
2. On air conditioner equipped models, checks should be carried out while the air conditioner is "OFF".
3. On automatic transmission equipped models, when checking idle rpm, ignition timing and mixture ratio, checks should be carried out while shift lever is in "N" position.
4. When measuring "CO" percentage, insert probe more than 40 cm (15.7 in) into tail pipe.
5. Turn off headlamps, heater blower, rear window defogger.
6. Keep front wheels pointed straight ahead.
OVERALL INSPECTION SEQUENCE
Inspection Procedure (Steps 1 - 2):
Inspection Procedure (Steps 3 - 5):
Inspection Procedure (Steps 6 - 10):
Inspection Procedure (Steps 11 - 16):
Inspection Procedure (Steps 17 - 20):
Inspection Procedure (Steps 21 - 23):
Inspection Procedure (Steps 24 - 28):
Inspection Procedure (Steps 29 - 32):
Inspection Procedure (Steps 33 - 36):
INSPECTION PROCEDURE